In an effort to better understand the results obtained from PCA and dPDF, a third analysis method, namely, multilinear regression (MLR) analysis of D(r) functions, was employed. This approach fits the composite D(r) functions using proportions of the pristine ZIF and inorganic glass D(r) functions, which can be considered as end members of the compositional series, according to equation 1. The residual difference between the experimental and the calculated composite D(r), denoted as residuals, may reveal any interactions at the interface as they cannot be present in the pristine ZIF-8 and pure IG D(r) functions.