SCATTERING OF AN ELECTROMAGNETIC-WAVE FROM A SLIGHTLY RANDOM DIELECTRIC SURFACE - YONEDA PEAK AND BREWSTER-ANGLE IN INCOHERENT-SCATTERING

The scattering of an electromagnetic wave from a two-dimensional, slig htly rough dielectric surface is studied based on the stochastic funct ional approach. It is shown that in the case of TM(p)-polarized incide nce there exists a zero in the incoherent scattering at the angle we c all the 'Brewster scattering angle', which depends on the incident ang le in contrast to the Brewster angle of coherent reflection which is i ndependent of the incident angle, that a 'quasi-anomalous scattering' can generally occur in the optically denser medium at the critical ang le of total reflection in both TE(s)- and TM(p)-polarized incidence, r egardless of which side of the random surface is illuminated, and that the Yoneda peak in the x-ray scattering can be interpreted as a speci al case of the quasi-anomalous scattering which becomes sharper when t he relative refractive index becomes closer to unity as in the x-ray r egion. Cross-polarized scattering and enhanced backscattering due to t he second-order effect are also calculated.