  Microwave power absorption by a two-layer system deposited on a metallic
surface has been studied in the experimental setup emulating the response to a
radar signal. Layers containing hexaferrite and iron powder in a dried paint of
thickness under 1mm have been used. The data have been analyzed within a
theoretical model derived for a bilayer system from the transmission line
theory. Good agreement between experimental and theoretical results have been
found. The advantage of using a bilayer system over a single-layer system has
been demonstrated. We show how the maximum microwave absorption (minimum
reflection loss) can be achieved through the optimization of the filling
factors and thicknesses of the two layers.
