The density distribution of two components for fundamental domain wall. The upper one is a kink in q₁ component, and the lower one is an anti-kink in q₂ component. This is a static domain wall, its stability is tested numerically against weak noises. The moving domain wall can be also demonstrated by the exact solution. The parameters are λ 1 = 0.01 , k 1 = k 2 = 0.02 , c 1 = c 2 = 2 , and α=0.