To experimentally validate the presence of large concentrations of both isolated and extended defects, accurate Xray diffraction experiments-possibly modelled with the maximum entropy method -should be able reveal significant disorder on the molecular sites even in the low temperature phase, and diffuse scattering experiment may reveal local correlations among these orientations. Furthermore, high resolution microscopy techniques such as transmission electron microscopy could lead to direct visualisation of (extended) defects, possibly through mapping of the associated strain fields.