The configuration space coordinates are defined using a spherical coordinate system (r, θ, ϕ) (see Fig. ) with r = 1, θ ∈ [0, 180°], and ϕ ∈ [0, 360°). For convenience and pictorial depiction as a equirectangular map, we reverse the order of the angular components and plot ϕ ("longitude") versus θ ("latitude"), and report the coordinates as (ϕ, θ). The full analytic expressions for the A-B i unit vector configurations resulting from the approach are provided in the Supplementary Information along with interactive tools for exploring the angular configuration space.