Table 1. Experimental data on the carbon-metal distance d _C and the energy shift ΔE _IS between the interface state and the surface state for single layers of flat-lying organic molecules and graphene layers on metal surfaces.

#	System	dC(Å)	ΔEIS(eV)
2	ZnPc/Cu(111)	2.49(3)41	0.2241
3	F16ZnPc/Cu(111)	2.66(10)41	0.1241
4	PTCDA/Ag(111)(LT-Phase)	2.81(2)44	0.56(3)6 ‡
5	PTCDA/Ag(100)	2.81(2)40	0.95(7)7 †
6	CuPc/PTCDA/Ag(111)	2.8145	0.7246 ‡
7	PTCDA/Ag(111)	2.86(1)37	0.665 ‡
8	NTCDA/Ag(111)	3.00(2)47	0.44(2)6,26 ‡
9	TiOPc/Ag(111)	3.00(3)48	0.3146 ‡
10	H2Pc/Ag(111)	3.07(7)49	0.32(3)50
11	Tc/Ag(111)	3.1643	0.2251
12	PFPEN/Ag(111)	3.16(6)52	0.21(6)46 ‡
15	PTCDA/Au(111)	3.27(2)53	0.164(4)11
1	g/Ru(0001)(L-Area)	2.20(7)54,55,56,57	1.67(7)54 †
13	g/Cu(111)	3.2636	0.2458 ‡
14	g/Cu(111)	3.2636	0.1559
16	g/15ML-Ag(111)/Ir(111)	3.3336	0.2060
17	g/Ir(111)	3.38(4)61, *	0.0062
18	g/Ru(0001)(H-Area)	3.70(7)54,55,56,57	0.00(6)54 †
	PTCDA/Ag(100)(DFT)	2.81(2)40	0.637 †
	PTCDA/Ag(111)(DFT)	2.86(1)53	0.5624
	NTCDA/Ag(111)(DFT)	3.00(2)47	0.3224

The numbering corresponds to that of the data points in Fig. 3 in addition, results of DFT calculations are listed for NTCDA and PTCDA on Ag surfaces.(Annotations: ^†energy relative to the one of the respective surface resonance of the bare substrate, ^‡relative to energy of Shockley state of the bare substrate from ref. 63, *average distance).