A model describing the propagation of radiation in disperse close-packed layers of optically soft particles is proposed. The model is based on the radiative transfer equation used for describing a light field in the multiple scattering regime and on the interference approximation for describing collective scattering effects; it also takes into account the Fresnel reflection at the layer boundaries. To describe the single-scattering characteristics, the Mie formulas are used. The model allows one to consider scattering in layers of any optical thickness. Calculations of the angular structure of the radiation leaving the layer and estimates of the errors of the calculations were performed. The possibility of forming a maximum at small scattering angles in media with correlated particles is shown. The theoretical results are in good agreement with the available experimental data.
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