Face	Surface energy (J/m²)	Work function (eV)	Reference
(0001)-Zn	1.64	5.568	LDA	This work
	2.08	5.713	GGA-PBE	This work
		5.1	[71]
		4.08	[72]
		3.7	[73]
		3.7	[74]
		3.15	[75]
	2.0		[76]
	2.25		[77]
(000-1)-O	1.68	5.60	LDA	This work
	2.04	5.79	GGA-PBE	This work
		6.0	[73]
		4.85	[75]
		4.8	[71]
		4.5	[74]

	2.04		[77]
(0001)-Cu	0.69	5.74	LDA	This work
	0.78	5.23	GGA-PBE	This work
		4.58	[78]
		4.84	[79]
	0.71		[80]
(0001)-O	1.35	6.43	LDA	This work
	1.72	6.28	GGA-PBE	This work
	1.63		[78]