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A full-wave approach is used to investigate electromagnetic scattering from three-media irregular-layered structures. The surface height of the rough interface is characterized by a family of gamma probability density functions (pdfs) of order K. For random rough surface heights characterized by one-sided pdfs, the thickness of the coating material can be chosen to be positive everywhere. When the rough surface heights are characterized by the familiar (two-sided) Gaussian pdf, convergence problems arise since a finite probability exists that the thickness of the coating is "negative".
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Bahar et al. (1998) studied this question.
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