Table 1. Intermolecular Distances between Propene Molecules of the First and the Second Adsorbate Layer, as Displayed in Figure 2c^a.

	C2–C2 dist. [Å]	shortest dist. [Å]
P1–P4	4.81(10)	2.86(14) (C3–C1)
P2–P4	4.22(10)	2.85(14) (C1–C1)
P3–P4	3.12(13)	2.68(12) (C3–C2)

^aC₂–C₂ distances and the shortest distance between two carbon atoms of each pair of propene molecules, with the respective carbon atoms in brackets.