Some results of a theoretical study on the interaction of an electromagnetic plane wave with a coated sphere are presented. The finely stratified sphere model (Kai, L., and Massoli, P. 1994, Appl. Optics, 33, 501) is used for numerical calculations. It is found that when the refractive index of the core is larger than the refractive index of the coating, the Qcu-x spectrum for a coated sphere differs from the spectrum of a homogeneous sphere hy having both sharp minima and sharp maxima, all corresponding to strong electromagnetic resonances at the interface of the core and the coating.
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