Many solid dielectric materials have an almost flat dielectric loss over a very wide range of frequencies extending in some cases over several decades between the subaudio and microwave frequencies. This flat loss is often accompanied by superimposed Debye-type loss mechanisms, giving pronounced peaks in more limited frequency ranges and producing the characteristic frequency dependence of the imaginary part of the dielectric susceptibility χ″(ω) ∼ ωτ/(1 + ω2τ2) (1) Here τ is the relaxation time corresponding to the particular loss mechanism and the relaxation frequency 1/τ may lie anywhere between infrared frequencies for atomic polarizations and subaudio frequencies for slow rotational polarizations, for example, in polymeric materials.