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The analytical and numerical study of the angular dependence ofmagnetoresistance in layered quasi-two-dimensional (Q2D) metals is performed.The harmonic expansion analytical formulas for the angular dependence ofFermi-surface cross-section area in external magnetic field are obtained forvarious typical crystal symmetries. The simple azimuth-angle dependence of theYamaji angles is derived for the elliptic in-plane Fermi surface. Theseformulas correct some previous results and allow the simple and effectiveinterpretation of the magnetic quantum oscillations data in cupratehigh-temperature superconducting materials, in organic metals and other Q2Dmetals. The relation between the angular dependence of magnetoresistance and ofFermi-surface cross-section area is derived. The applicability region of allresults obtained and of some previous widely used analytical results isinvestigated using the numerical calculations.

Angular dependence of magnetoresistance and Fermi-surface shape in quasi-2D metals