Wave equation solution for multilayer planar waveguides in a spatial frequency domain - A. I. Ievtushenko; M. G. Dusheyko; V. A. Karpyna; O. I. Bykov; P. M. Lytvyn; O. I. Olifan; V. A. Levchenko; A. A. Korchovyi; V. M. Fitio; A. V. Bendzyak; Yaremchuk I. Y.; Y. V. Bobitski (Semiconductor Physics, Quantum Electronics and Optoelectronics, 2017)