The Stern Gerlach experiment was meant to prove the orbital quantization of electrons where there should be +ml,0,-ml states. So for l=2, there should be 5 beams.
But they saw 2 beams, which was shown to be due to the 2 states of spin.
Now, because of the addition of the spin magnetic moment, shouldn't there be now 10 beams?(2 additional states for each the 5 orbital states).
What happened to the orbital magnetic contribution?