From Figure , we observe significant disparity between the PL image and the CLIM outputs: correlation, cluster, and silhouette maps. The correlation map (Figure ) displays microscale 10 regions of various sizes and shapes with high correlation at their centers, separated by low correlation boundaries. The application of an optimal threshold (in this case, 0.7) reveals the same film as an array of microscale clusters, or functional domains (Figure ). Lower correlation boundaries in the correlation map generally align with the boundaries of each cluster as shown in Supporting Note VI.