It is interesting that in cases where the surface does not have the geometry and periodicity of the bulk-terminated plane, the interaction of hydrogen with surface atoms is strong enough to unreconstruct the complicated reconstruction patterns.
Source: wiktionary
The argument for describing these surfaces as bulk terminated, as chlorine adsorption is known to unreconstruct silicon surfaces, was presented in chapter 1.
Source: wiktionary
Hydrogen adsorption can unreconstruct surfaces and passivate surface dangling bonds, and thus can change the surface properties dramatically.
Source: wiktionary