The discussion focuses on analyzing the angular distribution of a scattered field from a rough surface. The user inquires about using field distribution to derive the angular distribution of scattered fields and how to project this onto plane waves. It is noted that the surface behaves specularly at low grazing angles, with the transition point defined by the Rayleigh Roughness criterion, where the RMS height of surface irregularities is less than lambda/(8 x cos Theta). The angle of incidence, Theta, is crucial in this analysis. The conversation emphasizes the relationship between surface roughness and scattering behavior, highlighting the importance of understanding these dynamics in wave reflection studies.