Elbow plots (i.e. V(Z,r)) resulting from the H2 + Pt(111) PES computed with the PBEα-vdW-DF2 functional with α = 0.57, and interpolated with the CRP method for four high symmetry configurations with the molecular axis parallel to the surface (θ = 90◦), for (a) the top site and φ = 0◦, (b) the hcp site and φ = 30◦, (c) the bridge site and φ = 0◦ (bridge-to-top), and (d) the t2h site and φ = 120◦ (see also Figure 01). Barrier geometries are indicated with white circles, and the corresponding barrier heights are given in table 02.