Extended Data Fig. 1: Heterobilayer twist angle.
From: Interlayer exciton laser of extended spatial coherence in atomically thin heterostructures
a, b, Optical image (a) and angle-resolved SHG measurements (b; open circles) of WSe2/MoSe2 heterobilayers. c, d, As a, b but for a different sample. The field of view of the optical images is around 60 μm. Solid lines in b, d, are fits by a cos2(3θ) function, which give relative twist angles of 0.22°± 1.78° for b, and 0.34° ± 1.5° for d.
