02-28U

In the framework of the macroscopic electrodynamics we consider reflection, transmission, and absorption of electromagnetic waves by dielectrics with losses and surface conductivity (lava-like fuel-containing materials, LFCM). For a plane monochromatic wave, which falls on a surface of such a dielectric normally from air, the reflection, transmittance, and effective absorption coefficients are calculated. Numerical values of the found quantities calculated for different types of LFCM suggest that the processes of heating of relatively thin (less than 1.5 m) layers of LFCM are the most efficient at frequency of external wave of 1 GHz. It is shown that increase in the surface conductivity decreases the efficiency of the bulk heating.