A new crystallographic modification (kappa(L)') was found in the BEDT-
TTF:M(CF3)(4)(-):solvent (M = Cu, Ag, Au) system. The structure of mon
oclinic (BEDT-TTF)(2)Cu(CF3)(4)(1,2-dibromo-1-chloroethane = DBCE) is
reported. It differs from the orthorhombic kappa(L)-phase by having al
l BEDT-TTF molecules tilted in the same direction with respect to the
conducting plane normal, whereas in kappa(L) the tilt direction altern
ates between layers.