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Scaling laws which reduce the radiative transfer problem in an isothermal, absorbing-emitting planar layer, to the heat exchange problem in non-participating media between two parallel gray surfaces, are developed. The reflectivity and the potentials due to the surface temperatures become the parameters to be scaled. The scaled parameters are obtained by matching the heat fluxes leaving the original layer. The resulting scaled non-participating reflectivity is found to be a function of the original medium reflectivity and the optical depth. The scaled non-participating surface potential includes the influence of the boundary conditions and is related to the system radiative energy transfer. Excellent agreement is shown for the layer reflectance, transmittance, and emittance of some anisotropic scattering media, which are scaled to a non-participating layer, using this and previously developed scaling laws.