Chaotic Scattering in the Regime of Weakly Overlapping Resonances
  We measure the transmission and reflection amplitudes of microwaves in a resonator coupled to two antennas at room temperature in the regime of weakly overlapping resonances and in a frequency range of 3 to 16 GHz. Below 10.1 GHz the resonator simulates a chaotic quantum system. The distribution of the elements of the scattering matrix S is not Gaussian. The Fourier coefficients of S are used for a best fit of the autocorrelation function if S to a theoretical expression based on random--matrix theory. We find very good agreement below but not above 10.1 GHz. 
B. Dietz, T. Friedrich, H. L. Harney, M. Miski-Oglu, A. Richter, F.   Schaefer, H. A. Weidenmueller