The scattering of alkali (²P₃/₂) atoms with mj = +3/2 or -3/2 from at. rare gas targets shows a left/right asymmetry. The origin of this asymmetry is due only to different couplings of the orbital angular momenta of the heavy-particle motion. The quant. variations in the series of measurements with Kr, Ar, and Ne depend on the different ratios of spin-orbit to orbit-axis interactions. "Stereo specificity" is clearly seen in the particular case of relatively strong spin-orbit interaction only.