However, no significant correlation is observed between the cation diffusivity and any of the other principal components, with a maximum absolute Pearson's R of 0.57 for PC 2 (Figure ). We observe both positive and negative feature weights for PC 1 as shown in Figure depending on the nanoparticle separation. Since there exists a strong negative correlation between the PC 1 value and the cation diffusivity, and g(r) ≥ 0, the features with negative (positive) weight can be interpreted as important structural characteristics that correspond to high (low) cation diffusivity.