We designed the simulation framework in a way that allowed us to capture the two principal -and at the same time opposing -aspects of EMT. On the one hand, we aimed for the size of the unit cell to be large enough to cover the concentration regime (≈ 1 -10 MPM) where EMT takes place. On the other hand, since the average radius of the metallic and non-metallic domains pertinent to EMT has been estimated to be 15-25 Å, the simulated unit cell should also be roughly commensurate with this size, i.e., small enough not to average out these struc-tural inhomogeneities. Hence, we deliberately chose the size of the unit cell of about 15 Å containing at the experimental density 64 ammonia molecules with a varying number of solvated dielectrons and Li + cations to mimic concentrations of 3.0 -11.1 MPM (for details see SI).