In figure , we calculate the type of site each H-atom belongs too in figure . The site types are calculated by finding the number of Pt atoms within a cutoff radius. We find at all temperatures the vast majority of sites are 'on-top' where only one Pt atom is within the cutoff radii. With increasing temperature the dominance of 'on-top' sites is only slightly disrupted with the presence of some 'bridge' sites, where two Pt atoms are present within the radii. In our ensembles generated using our long tuned pyGlobOpt runs with xTB as the energetic driver we find the presence of multiple different sites, up to 6 Pt atoms present, we show the full breakdown in table . This pattern is true for both Pt 13 H 2 and Pt 13 H 4 . This is counter to what had been observed for studies performed on Pt 55 NPs, where they found 'bridge' sites to be the most stable. There could be multiple reasons for this discrepancy including: xTB being insufficient to capture the correct bonding characteristics, Pt 55 exhibiting significantly different chemistry, the fact a 'perfect' NP was used instead of a GM, or the relative hydrogenation being significantly higher for the structures that we study.