Has the 2-stage Stern-Gerlach experiment been performed?

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SUMMARY

The 2-stage Stern-Gerlach experiment, which demonstrates electron spin states in superposition, has indeed been performed, contrary to Richard Feynman's assertion in his lectures. The experiment referenced is the "Double Stern-Gerlach experiments on Mn@Sn12: Refocusing of a paramagnetic superatom," which confirms orthodox quantum mechanics (QM). While Feynman's lectures provide a foundational understanding, they may not reflect the latest experimental advancements in quantum physics.

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Ali Lavasani
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In http://www.feynmanlectures.caltech.edu/III_05.html#Ch5-S1, Feynman mentions that the 2-stage Stern-Gerlach experiment, which proves the electron spin states to be in a superposition, has never been actually done! I have also not seen any paper reporting such an experiment. My question is, has this experiment actually been done, and if so, have its results confirmed orthodox QM?
 
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Also note that the Feynman lectures are quite old and therefore are going to be outdated on many things, especially what has been done experimentally and what has not, but that the theory remains solid.
 

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