We first answer this question assuming an AO basis where every ψ is a pz-orbital. Here, every ∇ψ is multiplied with a ψ that bears a nodal plane in the plane of the molecule. As a consequence, any contribution to the current density will be exactly zero in the plane of the molecule. This principle is broadly applicable, in particular for systems where their current density is predominantly governed by their π-system such as graphene. For the current density across bonds, ∇ψ is multiplied with a ψ that has a nonzero magnitude. The absence of a nodal plane between different AOs across the bonds prevents any suppression of the current density. If we switch our perspective to an MO basis, the story remains similar: each ψ will still have a guaranteed nodal plane in the plane of the molecule. This implies that, regardless of how strong the contribution across the nodal plane from ∇ψ might be, that contribution will be suppressed. Yet, upon turning our attention to the HOMO and HOMO-1 (see the bottom row of Figure ), we encounter a shift in the story. We observe that the nodes positioned between bonds vary in location among different orbital-gradient pairs. This lack of consistency means there is no uniform suppression of the current density, leading to the absence of nodal planes between bonds in the resulting current density.