For $2p_{1/2}$ ($l = 1$, $j = 1/2$):

Relativistic: $-2.64 \times 10^{-5}$ eV - Spin-orbit: $-3.01 \times 10^{-5}$ eV - Darwin: $0$ eV (because $l = 1$) - **Total: $-5.65 \times 10^{-5}$ eV**