coplanar transducer and compared to additional results made with a microstrip transducer. One measurement run at a single microwave frequency requires about 15 min of VNA time, a scan across the entire frequency range together with a background scan requires a day. These large time requirements limited the number of cases examined and only two frequencies were studied across the entire range using the microstrip transducer. The microstrip results were in complete agreement with those from the coplanar waveguide. The measurements on Series 2 were made using the microstrip transducer only, allowing also data to be taken for two sample orientations: one with the film facing the transducer and one with the substrate facing the transducer. Moreover, the microstrip transducer turned out to be of a slightly better microwave quality than the coplanar one. Two additional measurements were made in order to make comparison with very different techniques. One set of data was collected using a section of a hollow waveguide in transmis- sion and reflection, and a Varian 4 cavity in reflection. Another set of results was collected using a Brillouin light scattering technique. Results from the single layer reference Py films in Series 2 are shown in Fig. 3 for driving at 7.5 and 18 GHz. A fundamental resonance and a standing spin wave mode can be identified for each film except the thinnest 30 and 40nm-thick films at 7.5 GHz. For these films this frequency is lower than the minimum frequency for observation of the first SSWM. The strongest absorption peak is identified with the fundamental resonance mode. The resonant field for this mode is independent of Py thickness, suggesting that surface anisotropies can be neglected. The smaller peak is identified with the first (odd symmetry) SSWM. Since there is no evidence for surface anisotropies, the SSWM is assumed to be unpinned. The resonant fields for this mode are well described using our theory [14] with an exchange constant of A = 6 · 10 − 7 erg/cm, a gyromagnetic constant of 2.82 MHz/Oe, and a saturation magnetization for Py of 4 πM$_{s}$ =8320 G. Details of the fitting procedure are given at the end of this section. The value for 4 πM$_{s}$ derived from the broadband FMR measurements is consistent with results obtained with SQuID magnetometry from the 74nm thick reference sample of Series 1. A saturation magnetization for the Py given by 4 πM$_{s}$ =8000 G was obtained from out of 7 4. Single-layer films