Most of the peaks in PC1 (72.68%) correspond to the peaks in the glass PDF and its weighting decreases as the amount of Ti-MOF in the mixture increases (Figure , S52.b). PC2 (24.93%), in contrast, exhibits the same features as the pristine Ti-MOF PDF with its weighting increasing as the amount of Ti-MOF in the mixture increases (Figure , S52.b). The equivalence between PC1 and the IG D(r) and between PC2 and the Ti-MOF D(r) are not exact though, as seen by the longer-ranged features in PC1 that are absent in the glass D(r) but are reminiscent of the Ti-MOF D(r) in this r-range (Figure ). This also explains why the weightings in (Figure .b) are sometimes negative and why the end members of the series (pristine Ti-MOF and the IG) are not composed of pure PC1 or PC2.