Magnetic phase diagram of RbzMnBr4 .2H,O. K. Carrander (Institute of Physics, University of Uppsala, Uppsala, Sweden). Physica Scripta (Sweden)-7, 295-297, 1973.The magnetic phase diagrams of RbzMnBr4 . 2Hz0 with the magnetic field parallel and perpendicular to the preferred spin direction are presented. The Nee1 temperature is (3.35k0.03) K, and the triple point is at T,=2.5 K and H,=2.107 Aim (24 kOe). The exchange field HE and the anisotropy field HA are 1.9.106 Aim (24 kOe) and 1.5.106 Aim (18 kOe) respectively.The data is compared with the predictions of the molecular field theory.