Orientational correlation functions G1(r) and G2(r), Equations 4 and 5, respectively, report on the relative orientations between pairs of molecules, where θij is the angle between a reference vector on molecule i and the equivalent vector on another molecule, j. In this study, g(r), G1(r), and G2(r) were determined using vectors defined between the carbon atoms at the 4 and 4′ positions of the biphenyl moieties, and distances, rij, were determined between the centre points of these two vectors.