Reliable (reported energy within 300 eV of a reference energy)
Comment:
1.6, 3.2 and 4 - 10 A Si/5.2 A GaAsOx/Si-doped GaAs(100). GaAsOx was grown by electron stimulated oxidation on GaAs(100). There was a state of pure Si in the spectrum. The thickness was measured by XPS.