The folder contains all the DFT and DFPT calculations reported in the manuscript. The folder EPW contains all the isotropic and anisotropic calulcations, with and without spin orbit interaction performed with the EPW code. The folder Phonons_QuantumEspresso contains the calculation of the phonon dispersions and electron-phonon interaction performed with the Quantum Espresso code and a brute force integration over the Briolluin zone. The folders Doping and Strain contain the phonon dispersions and electron-phonon coefficient as a function of doping (simulated with additional charges plus a uniform jellium background) and biaxial strain. The name of the subfolders within both of the folders indicate the amount of strain and charge (fraction of the elemental charge) respectively. The folders Wannier* contain the calculations done on a rectangular supercell and the subsequent wannierization to highlight the edge states.