A triangular rod (edge length of the basic triangle is a) is considered. Analytic expressions of the chord length distribution density A(l, a) and other structure functions of small-angle scattering are calculated. Applications of A(l, a) in the field of SAS are discussed. The three-dimensional correlation function and the asymptotic behaviour of the SAS intensity I(h) are analyzed. Here, the Kirste-Porod term is missing which correlates with the fact that parallel interfaces do not exist.
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