Exact(6)
Most of the A islands exhibit an equilateral-triangle shape.
Similar to the type A islands, the type B islands also exhibit a (2 × 2) surface periodicity.
It can be seen that the surface of type A islands exhibits a hexagonal closed-packed symmetry with a (2 × 2) periodicity.
Most of the type A islands exhibit an equilateral-triangle shape with edges oriented along the Si < −110 > directions, coinciding with the threefold symmetry of the Si (111) substrate.
The heights observed for the type A islands prove that the 2 × 2 phase is FeSi1 + x (0 ≤ x ≤1) because the corresponding crystal structure has a spacing of 1.57 Å between equivalent atomic planes.
Furthermore, the tunneling current voltage (I-V) curve measured on top of the type A islands (Figure 2c) exhibits a semiconducting character with a band gap of approximately 0.9 eV, verifying that the 2 × 2 phase is not γ-FeSi2 because γ-FeSi2 is metallic [5, 9].
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
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