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Scale of the surface layers from relaxation and density. (a) Dynamical length scale ξτ of substrate and free surfaces function of T with two thicknesses. The dynamical length scales at both interfaces grow upon cooling, but ξτ of substrate is constrained when its value ≈hg/2. (b) Length scale from density of substrate and free surface as function of T. We see that the length scale of the substrate grows, while the length scale of the free surface shrinks upon cooling.
