PROPERTIES OF NEMATIC LC PLANAR AND SMOOTHLY-IRREGULAR WAVEGUIDE STRUCTURES: RESEARCH IN THE EXPERIMENT AND USING COMPUTER MODELING Article Egorov A.A., Sevastyanov L.A., Shigorin V.D., Ayriyan A.S., Ayriyan E.A. Computer Optics. Institution of Russian Academy of Sciences. Vol. 43. 2019. P. 976-982