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The numerical method presented tries to solve in elegant way the problem of scattering from a random rough surface illuminated by a large incident beam. The beam simulation enables one to give a rigorous solution of this difficult problem as soon as the problem of scattering by such a surface illuminated by a narrow beam is solved rigorously. A numerical example for perfectly conducting two-dimensional random rough surface.
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Saillard et al. (1988) studied this question.
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