Abstract
Rb2MnCl4 was always considered to be an ordinary quasi-two-dimensional uniaxial weakly anisotropic antiferromagnet with the crystallographic c axis as the easy axis. This picture became dubious when a splitting was observed of one of the magnetic modes for an external magnetic field applied perpendicular to the c axis. New magnetic resonance measurements revealed also a splitting of the zero-field antiferromagnetic resonance. All the unexpected phenomena observed in this investigation can be explained in terms of an orthorhombic distortion of Rb2MnCl4 in its antiferromagnetic state, taking into account that all samples are of the multi-domain type below the Neel temperature.
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