Intrinsic and extrinsic x-ray absorption effects in soft x-ray   diffraction from the superstructure in magnetite
  We studied the (001/2) diffraction peak in the low-temperature phase of magnetite (Fe3O4) using resonant soft x-ray diffraction (RSXD) at the Fe-L2,3 and O-K resonance. We studied both molecular-beam-epitaxy (MBE) grown thin films and in-situ cleaved single crystals. From the comparison we have been able to determine quantitatively the contribution of intrinsic absorption effects, thereby arriving at a consistent result for the (001/2) diffraction peak spectrum. Our data also allow for the identification of extrinsic effects, e.g. for a detailed modeling of the spectra in case a "dead" surface layer is present that is only absorbing photons but does not contribute to the scattering signal. 
C. F. Chang, J. Schlappa, M. Buchholz, A. Tanaka, E. Schierle, D.   Schmitz, H.Ott, R. Sutarto, T. Willers, P. Metcalf, L. H...
cond-mat.str-el