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. 2018 Mar 16;8:4710. doi: 10.1038/s41598-018-22983-6

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Thickness dependence of the mean free path at 10 K. Data have been derived from the resistivity values measured at the same temperature (i.e. ρ₁₀) for either 10 μm (blue dots) or 50 μm (red dots) wide films. Yellow filled symbols correspond to films (10 μm wide) deposited on a sapphire substrate; all the other films have been deposited on SiO₂. Continuous line is a guide for eyes.