(a) and (b) Schematic of a two-terminal device with periodically and randomly distributed adatoms, respectively. Both adatom coverages are 11.1%. (c)–(e) Comparison of conductances G between periodic and random adsorption as a function of Fermi level ε_F. (c) and (d) The site potential and intrinsic SOC are set to U = 0.36t and λ_SO = 0.016t. The adatom coverages are 11.1% in panel (c) and 6.25% in panel (d). In panel (e) the magnetic adatoms coverage is 11.1%. Circle and triangle symbols represent the periodic and random adatoms. The error bars denote the conductance fluctuations. Adapted from Ref. [34].