N.33 Setting the record straight on alignment

Some sources claim the spin is under an angle with the magnetic field; this is impossible since, as pointed out in chapter 4.2.4, the angular momentum vector does not exist. However, the angular momentum component along the magnetic field does have measurable values, and these component values, being one-di­men­sion­al, can only be aligned or anti-aligned with the magnetic field.

To intuitively grab the concept of Larmor precession, it may be useful anyway to think of the various components of angular momentum as having precise nonzero values, rather than just being uncertain. But the latter is the truth.