A comparison across all 54 simulations from AIMD of the radial distribution functions (RDF) for a-Al2O3 compared to the Lamparter et al RDF from 1997 is shown in the Supplementary Information Fig. . Interestingly, a majority of the models with varying densities, equilibration temperatures, and cooling schemes have comparable RDFs with experiment, prompting a further narrowing of this initial set of data in order to obtain a model which is specific to the experimental ALD deposited a-Al2O3 .