LIMIT FORM OF THE EQUATION OF ANISOTROPIC HEAT CONDUCTION IN A LAYER A. I. Moshinskii UDC 53.01 Consideration is given to the problem of asymptotic reduction to a two-dimensional equation of an equation that is three-dimensional along the coordinates and describes the process of heat propagation in an anisotropic material. The region of heat transfer is a layer that is thin along one coordinate. It is assumed that the matrix of the thermal diffusivities depends on the spatial coordinates. The effective thermal-diffusivity matrix is represented in the constructed equivalent heat conduction equation. JEPTER7492019993 JEPTER749203