An electrical engineer models the impedance of two components in series as $Z_1 = 4 + 2i$ ohms and $Z_2 = 1 - 5i$ ohms. If the total impedance $Z_{total}$ is the sum of $Z_1$ and $Z_2$, what is the phase angle of the total impedance, given by $\theta = \arctan(\frac{\text{Im}(Z_{total})}{\text{Re}(Z_{total})})$?