We propose to use OSIRIS to determine the magnetic structures of a series of cobalt oxysulfides containing Co in square planar coordination. Several compositions Sr2CoO2Cu2-xLiyS2 and Sr2CoO2Cu2-deltaS2 prepared using low temperature chemical methods will be examined. The aim is to correlate the detailed structure with the composition. This accompanies companion experiments on POLARIS and HRPD to probe the crystal structures which will enable the magnetic structures of these materials to be determined and the size of the ordered moment to be correlated with composition and the fine details of the crystal structure.