, where θ is the angle between the thiophene rings) is displayed in Figure . The value of the order parameter describes the preference to a given relative orientation: values close to 1 are indicative of a preferred parallel orientation, close to -0.5 refer to perpendicular orientation, and values close to 0 indicate that no preference is present. The profiles displayed in Figure reveal that in all cases, a parallel orientation is adopted by thiophene rings at close distances (as expected because of their stacking); in a similar fashion as in Figure , the order parameter at longer distances is larger with increasing sorbitol concentration, confirming that the larger degree aggregation of the PEDOT chains leads to a more ordered stacking of the thiophene rings that extends to longer distances. Such behavior may explain why the PEDOT oligomers tend to adopt a more extended conformation for the larger sorbitol concentration More details on the relative stacking of the PEDOT oligomers are shown in Figures , that display the contour plots of the distribution function of thiophene pairs as a function of both the distance and the angle between thiophene rings in different chains, for the different sorbitol contents. In the absence of sorbitol (Figure ), a relative parallel orientation of the rings is predominant only at the shortest distance (about 3.5), suggesting that stacking typically involves no more than two chains. With increasing sorbitol content (Figures S7, S8 and S9), not only the population of parallel rings at the shortest distance becomes larger, but also the occurrence of a certain population of parallel chains at a longer distances (about 5 and 7) is observed, suggesting that the stacking extends more over space involving even the stacking of three chains.