EPR spectroscopy has become an increasingly powerful tool to examine the spin states and dynamics of single-molecule magnets, but has not been exploited to probe bulk magnetically ordered phases of molecular magnets. In this article, we review the EPR spectra of antiferromagnets and canted antiferromagnets below T-N with particular reference to our own studies on the canted antiferromagnet, p-NCC6F4CNSSN (T-N = 36 K). The antiferromagnetic resonance experiment allows the saturation of the sublattice magnetisation to be probed. In addition, the exchange and anisotropy fields (H-e and H-a), the spin-flop field (H-sf) and for canted antiferromagnets, the Dzyaloshinskii-Moriya field (H-DM), which gives rise to the spontaneous moment, can be determined. (C) 2003 Elsevier Ltd. All rights reserved.