First derivative of the ARPES data measured in the ΓK direction of the (√3×√3)R30° domain for (a) graphene/Pt(111) and (b) graphene/Pb/Pt(111) using of a photon energy of 62 eV. Blue dashed lines highlight the spectral features originating from graphene rotational domains with periodicities different from (√3×√3)R30°. (c, left) LEED pattern of graphene/Pb/Pt(111) taken at Ep = 150 eV. Blue circles mark the reflexes coming from different rotational domains of graphene with respect to Pt(111). (c, right) 2D reciprocal lattices of graphene (√3×√3)R30°, Pb c(4 × 2) (with three equivalent rotational domains of Pb relative to Pt(111)) and Pt(111) (1 × 1) shown in black, yellow, and violet, respectively. (d) Sketch of the graphene/Pb/Pt(111) atomic structure deduced from the LEED measurements with black, yellow, and gray balls showing carbon, lead, and platinum atoms, respectively.
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