The three stacked polyhedral Au layers that constitute the metallic core (114 atoms, rhombicosidodecahedron) can be clearly identified. The first two shells of the core consist of 12 and 42 atoms, respectively. One should note that the first peak corresponds to the first Au layer, while the second and third peaks reflect the second Au layer (MacKay icosahedron). The fourth peak at 0.7 nm corresponds to the outer layer of the Au core and gives an estimate for the metallic core. Between 0.9 and 1.0 nm, we find S and Au (surface) atoms according to their colinear positioning in the RS–Au–SR oligomers (Figure 2), as suggested by electronic structure calculations and X-ray diffraction measurements for AuNPs.(3) In our model, additional constraints (together with added nonbonded parameters) maintain the correct surface structure of the Au core, Au surface atoms, and S atoms (see the Supporting Information). Otherwise, these atoms would overlap because of lacking repulsive forces.