Fig. 2: Simulated results for the extraction of the rotational offset using a Fourier spectral analysis of the moiré lattices formed by two identical overlapped patterns.

a Simulated images of base and moiré lattices (insets show the corresponding Fourier-transformed images of the overlapped patterns (pn + pn+1) for the periodic structures). b The measured rotation angle (θM) as a function of the input rotation angle (θR).