V.V. Lider Federal Scientific Research Center "Crystallography and Photonics", Russian Academy of Sciences, Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii prosp. 59, Moscow, 119333, Russian Federaion
Functional principles, state of the art, and issues of multilayer X-ray optics are reviewed. Methods to optimize planar multilayer interference structures and multilayer diffraction gratings and their application in academic research and technology are discussed.