Based on this model, the minimum pulse width required to charge the interface sufficiently for a local electrochemical current to occur is then given by α and Equation 1 for a given tip-substrate distance, required potential, and pulse height. For a certain pulse width (tpulse), we can rewrite Eq. 1 so that we obtain the maximum tip-substrate distance at which the substrate is sufficiently charge to enable the electrochemical reaction: Equation 2 highlights that the distance of significant charging can be well defined not only through the electrolyte properties (λD and D), but also varied through the experimental parameters Vpulse and Vreq (influenced by the electrochemical system and rest potentials), which influence the minimum charging time through the parameter α. This description can therefore be used to predict the maximum etching distance based directly on the employed electrolyte and the experimental details.