The strong interactions increase the degree of overlap between the water and PAO4 regions (Figure ), reducing the ITR. At 1.5 ML coverage and above, the hematite/PAO4 interactions are completely screened by the water layer and the ITR converges with the weak and intermediate FFs. The water layer isolates the PAO4 from the surface and the ITR at the water/PAO4 interface is governed only by the water/PAO4 interactions. Unlike for the anhydrous hematite/PAO4 interface, 10 there is no clear correlation between R k and W sl , as shown in Figure . This has also been noted from previous NEMD simulations of the interface between a hydroxylated surface and hydrocarbons. This observation is likely due to the screening effects of the hydroxyls and water molecules.