Usually copper grows on c-sapphire with orientation Cu(111)parallel to
A1(2)O(3)(0001) with Cu[2 $($) over bar$$ 1 $$($) over bar 1] along A
l2O3[2 $($) over bar$$ 1 $$($) over bar 10]. In the present work an ad
ditional orientation is described. To understand this orientation, a m
icroscopic model of roughness of the substrate crystal is proposed and
verified.