6H-SiC	4H-SiC
Crystal stacking sequence	ABCABC	ABCB
Lattice parameter	a=3.073A c=15.117A	a=3.076A c=10.053A
Band-gap	3.02eV	3.27eV
Dielectric constant	9.66	9.6
Refraction Index	n0=2.707 ne=2.755	n0=2.719 ne=2.777