Proton-coupled electron transfer chemistry has been largely discussed in terms of energy-based square schemes. We herein propose a unique way to identify the real Cartesian space equivalent of these square schemes. To this end, we define the proton portion of the overall PCET event via a linear interpolation between only the proton position at the reactants and the acceptor atom, and the electron portion via a linear fitting procedure that adheres to the Marcus-Hush model for electron transfer. These two independently identified cuts through the (3N -6)-dimensional space span a two-dimensional surface that incorporates all nuclear motions that are relevant to the overall PCET process. Using CASSCF/NEVPT2 calculations, the relevant states and their relative energies can be obtained.