Current technologies of the epitaxial growth of thin films make it possible to produce multilayer structures consisting of alternating layers of different materials with a thickness comparable with the crystal lattice constant. Such structures belong to superlattices and, due to their unique physical properties, are promising for the creation of various radio- and optoelectronic devices. In particular, multilayer structures consisting of alternating magnetic and nonmagnetic metallic layers can be used as detectors of magnetic fields, because they are characterized by the giant magnetoresistive effect [1]. Superlattices consisting of alternating dielectric layers with different permittivities are used as polarizers in switching devices in fiber-optic communication lines [2]. They can serve as filters and mirrors for electromagnetic waves of the x-ray, as well as optical, band [3,4]. In addition, superlattices are used to create various photonic crystals, which have been intensively studied in recent years [5, 6].
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