We calculate the Landauer transmission for all 6939 structures using a custom-made transport code implemented with GPAW. As described in Supporting Information part I, this approach employs wide-band electrodes with the non-equilibrium Green's function (NEGF) approach and DFT using the PBE functional and DZP basis set. Our transport code allows for very cost-effective calculation of the transmission without compromising the quality of the electronic structure calculation; using an energy grid of 200 data-points it takes less than 10 minutes to complete the transmission calculation of Si222 on a single processor. All custom scripts are described in Supporting Information part I and are available as open-source code.