Beschreibung:
<jats:p>Propagation of an electromagnetic wave in a nonhomogeneous medium in the presence of cutoffs and resonances is examined. Approximate formulas are derived for the reflection, transmission, and absorption coefficients, given in terms of the phase-integrals associated with all pairs of the neighboring cutoffs and/or resonances. The total (even) number of cutoffs and resonances is arbitrary, and phase-integral approximations up to the ninth order are admitted.</jats:p>