FIG. 3: (a) Optical micrograph of a pre-patterned ∼ 100 nm step on the SiC(0001) face following graphene growth. Scale bar is 2 µ m. (b) Raman map ( ∼ 1 µ m lat. res., 0.25 µ m grid) of the 2D peak intensity at this location indicates preferential graphene growth on the (1 ¯ 10 n ) facet. (c) HRTEM cross-sectional images of a similar step confirm preferential growth on the (1 ¯ 10 n ) facet. Scale bar is 2 nm, and applies to all insets. 11 (a) (b) 2D Peak Intensity (arb.units) 0 1000 SiC (c)