as pointed out by Guido J. Reiss it is difficult to obtain a reliable proton model of disordering by a regular X-ray single Chrystal analysis.
I'll suggest the paper for some insights into the problem:
Proton disorder and elasticity of hexagonal ice and gas hydrates by Sergey V Gudkovskikh and Mikhail V Kirov, DOI: 10.1007/s00894-018-3919-x
Nevertheless, a proton model of disordering may be obtained only by conjugating several technics like SCXRD, Synchrotron radiation and Neutron diffraction under different experimental temperature ranges.