Fig. 3
Temperature-dependent thermal conductivities and anisotropic ratio of hexagonal boron nitride (h-BN) crystals, and comparison with model predictions: a in-plane thermal conductivity kr, b out-of-plane thermal conductivity kz, and c anisotropic ratio (kr/kz) for h-BN samples with differently tuned isotope ratios. Lines for the experimental data are guides for the eye. The error bars in (a, b) correspond to the uncertainty of measured thermal conductivity results (see Methods for the details of uncertainty analysis)
