Considering the significantly enhanced molecule-sheet interaction observed on some of the doped sheets, it is probable that the adsorption in those cases also influences the molecule itself. This, in turn, may have its own consequences, as accommodating a new strong interaction is likely to weaken bonds within the molecule. Such modifications could potentially be advantageous in surface catalysis. Therefore, further consideration of the effects of doping is needed. To quantify the impact of adsorption on the O 2 molecule, we calculated the change in the O-O bond length using the formula