Supplementary Information for Ubiquitous Spin-Orbit Coupling in Iron-Based Superconductors

Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Area Science Park, S.S.14, Km 163.5, I-34149 Trieste, Italy International Centre for Theoretical Physics (ICTP), Strada Costiera 11, I-34100 Trieste, Italy