EN
Behavior of the magnetoresistance has been studied in organic quasi two-dimensional metal (ET)_{3}CuCl_{4}•H_{2}O. Shubnikov-de Haas oscillations have been observed at the magnetic field directions near H ∥ c*. The oscillations frequency at H ∥ c* equals 45 T that corresponds approximately to 1% of the first Brillouin zone cross-section. The angle dependence of the oscillations frequency allows one to imagine at least the part of Fermi surface in the form of cylinder with an axis along c*.