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We study the ${\text{2HDM}}$ contribution to the muon anomalous magneticmoment $a_\mu$ and present the complete two-loop result, particularly for thebosonic contribution. We focus on the Aligned ${\text{2HDM}}$, which hasgeneral Yukawa couplings and contains the type I, II, X, Y models as specialcases. The result is expressed with physical parameters: three Higgs bosonmasses, Yukawa couplings, two mixing angles, and one quartic potentialparameter. We show that the result can be split into several parts, each ofwhich has a simple parameter dependence, and we document their generalbehavior. Taking into account constraints on parameters, we find that the full${\text{2HDM}}$ contribution to $a_\mu$ can accommodate the currentexperimental value, and the complete two-loop bosonic contribution can amountto $(2\cdots 4)\times 10^{-10}$, more than the future experimental uncertainty.

The muon magnetic moment in the 2HDM: complete two-loop result