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We compare three attempts that have been made to decompose the angularmomentum of the electromagnetic field into components of an "orbital" and"spin" nature. All three expressions are different and it appears, on the basisof classical electrodynamics, that there is no preferred way of decomposing theangular momentum of the electromagnetic field into orbital and spin components,even in an inertial frame.

Comparison of different forms for the "spin" and "orbital" components of the angular momentum of light