In this chapter, the experimental techniques used over the course of this thesis will be explained. These are all common surface science techniques, ranging from measurements averaged over a large area of the surface (Auger electron spectroscopy, Section 2.1; low-energy electron diffraction, Section 2.2; etc.) to a very localised technique that can probe materials on the atomic scale (scanning tunneling microscopy, Section 2.3). The most accurate ab initio simulation technique available, density functional theory, is invaluable in explaining observed experimental results, and will be examined in Section 2.6.