It can be challenging to evaluate visually structural changes that the large PAH molecules examined here undergo upon adsorption. Nonetheless, it is important to understand these changes, as they can strongly impact molecular packing in monolayers and multilayers. The flattening of molecules in the vicinity of the surface can lead to footprint changes, impacting molecular packing in monolayers. The associated changes in molecular twist have relevance to multilayer interactions, and impact the chirality repercussions of multilayer assembly. To estimate the degree of deformation of the helicene molecules upon surface adsorption, we calculated the height of each helicene ring from the surface adatom position. The height of a ring is defined as the distance between the geometric center of the ring carbon backbone and the geometric center of the reference, projected on the z axis. On surfaces with one or more adatoms, the reference is the collection of all adatoms. In cases where no adatoms are present, the reference is the topmost layer of the surface. Comparisons between pristine surface ring-height plots and adatom-surface plots will provide information about how molecular structure deforms in the presence of surface adatoms.