Supporting Figure 3

3D-RHEED plan views of the single layer WS2 films grown on as-received substrate (a), on the substrates annealed at 1000 oC for 1, 2, 3, 5 h prior to growth (b-e). All annealed films show 0o orientation and, hence, there is no effect of the duration of annealing on epitaxial relations, which supports our conclusion of the annealing temperature being the main factor influencing the film orientation.