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Experiments of sheen gloss of metals and theoretical explanation of them are given. Sheen gloss is related with the specularly reflected light which appears by a incident angle above a critical angle θ c. θ c is connected with the r. m. s. roughness h as: aligned 2h₂=/k k=23 aligned This formula is explained by a theory similar to the Kirchhoff's diffraction theory, treating the roughness as a stationary random function given by Ornstein-Uhlenbeck process. Scattered light is separated to R - and D -comp. the former corresponds to sheen and its brightness is given as a function of incident angle ψ by aligned (-16^2h^{2}^{2}^2). aligned D - comp. is the part that represents scattered light.
Hasunuma et al. (Sun,) studied this question.
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