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. 2021 Apr 2;14(7):1763. doi: 10.3390/ma14071763

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) Sb chemical potentials $μ_{Sb}$ in different structures. (b) Corresponding inter-layer distances $d_{Sb}$ of the Sb BLs. Blue: 1BL-Sb@BS, green: 2BL-Sb@BS. Squares: distance $d_{1}$ between BS and 1st BL; circles: distance $d_{2}$ between 1st BL and 2nd BL. The vertical lines under the points for the 1st BL highlight the correlation between $d_{1}$ and $μ_{Sb}$ .