Density Functional Theory calculations were performed using the Vienna ab-initio Simulation Package (VASP) using the projector augmented wave (PAW) method. The Perdew-Burke-Ernzerhof (PBE) functional was used in each calculation with a plane-wave energy cutoff of 500 eV and k-point grid of 33 × 33 × 33 (6001 irreducible k-points) for all electronic structure calculations. Spin-orbit coupling was included in all calculations. The Fermi surfaces were calculated by interpolating the electronic structure on a k-point grid that is 5 times as dense using the iFermi software.