AddOn A.2 develops the internal angular mode structure required by the Version 1.0 equilibrium‑coupling interpretation of the electron. Where AddOn A.1 established the global energy law governing discrete internal equilibrium states, AddOn A.2 identifies the angular geometry that satisfies that law. This add‑on introduces a unified angular architecture built from: a two‑axis oscillatory geometry, a polarity inversion boundary, standing‑wave angular nodes, a phase‑twist symmetry generating spin‑½, and a dipole–quadrupole mode hierarchy. Together, these structures provide the physical origin of angular momentum, internal rotational symmetry, and the angular interference patterns observed in spectroscopy, scattering, and chemical bonding. AddOn A.2 does not introduce new ontology; it applies the Version 1.0 structural interpretation directly to the angular domain, completing the angular component of the equilibrium‑coupling framework.
James Reeves (Mon,) studied this question.