The current flowing through R2 is:
$\begin{aligned} & \mathrm{Req}_{\mathrm{eq}}=4 \Omega \\ & \mathrm{i}=\frac{8}{4}=2 \mathrm{~A} \\ & \mathrm{i}_1=\frac{2 \times 3}{3+6}=\frac{2}{3} \mathrm{~A} \\ & \mathrm{i}_2=\frac{2 / 3}{2}=\frac{1}{3} \mathrm{~A}\end{aligned}$