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Figure 1
The reference frame (x, y) is defined by the initial monolayer structure of lattice L0 (black). The first layer L1 (blue) is a copy of L0 rotated by [-\delta] around the origin, [L_{1} = \exp(-i\delta)\Lambda]. The second layer L2 (red) is a copy of L0 displaced by a rigid-body translation [\tau = \tau_{x}+\tau_{y}\rho \exp(i\varphi)] and then rotated by [+\delta], leading to [L_{2} = \exp(i\delta)(\Lambda+\tau)].

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ISSN: 2053-2733
Volume 81| Part 2| March 2025|
https://doi.org/10.1107/S2053273324012087
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