For PE and PE * , P (α OH ) for PE has a wide shoulder at around 30 • , which is commensurate with the formation of the well-known "dangling OH bond" 119,120 that facilitates the formation of a hydrogen-bond network; such phenomena has been noted at the water-air interface and for other water-hydrophobic surfaces. 121,122 By contrast, the probability of this orientation is slightly diminished in PTFE and considerably less for PVC. This characteristic aligns with the lesser observed hydrophobicity of PVC relative to PE and PTFE.