ior. By contrast, the structure of a (positionally or compositionally) disordered assembly, which lacks periodic order, is more subtle. Disordered structure is characterized statistically by spatial correlation functions, e.g., the radial distribution function or inverse Fourier transform of the static structure factor, experimentally determined by small-angle X-ray scattering (SAXS). However, since correlation functions describe structure averaged over a diverse ensemble of local particle arrangements, experimental measurements alone offer a limited view of the relationships between local optical properties and nanoscale structural features.