Supporting information for Physics-Guided Descriptors for Prediction of Structural Polymorphs Bastien F. Grosso, Nicola A. Spaldin, Aria Mansouri Tehrani for questions or remarks: b.grosso@ucl.ac.uk Please cite article: J. Phys. Chem. Lett. 2022, 13, 31, 7342–7349 Available here: Notebook to generate and handle the structures and DFT calculations Notebook to create and test the ML model All the data used to create the ML model in csv format Input files for the DFT calculations The cif files for 21 newly identified polymorphs