The relaxation dynamics of interfacial water can also be quantitatively associated with metrics for nanoscale surface hydrophobicity. This is shown in Fig. , which examines the correlation of dynamical relaxation of water with β∆f σ . While Figs. illustrate there are two qualitatively different groups, Fig. conveys that the behavior of certain polymer surfaces within a group can also be quantitatively distinguished with a resolution on par with nanoscale hydrophobicity metrics discussed prior. For the specific combination of a relaxation time and a free energy, invoking the concept of a transition-state-theory or Arrhenius-like relationship would suggest that τ -1 ∝ exp (-β∆f σ ). Indeed, Fig. reflects reasonable linear correlation, particularly for τrot,1 via Eq. ( ), indicating that such dynamical measures may also provide useful proxies for describing relative surface hydrophobicity. However, it should be noted that the formation of hydrophobic pockets has also been shown to slow down water dynamics even while possessing low dehydration free energy, 118 such that this analysis should be done with care, particularly for dynamic surfaces.