Numerically integrated correlation C(f) for the ideal 2D layers of (a) parallel lines and (b) a circle, the ideal 3D layers of (c) parallel planes, (d) a cylinder, (e) a sphere, in the center x = 0 and off-center by x = 0.87 with R = 1, r² = 1, and a ∆x = 0.1 of radial (“r”, dotted), axial (“a”, dash-dot), or tangential (“t”, dashed) orientation; light to dark solid lines display the ideal isotropic correlations for the dimensions D = 1, 2, 3, cf. Table 1.