Fig. S2.

Localized states of self-stress for frame corresponding to design of Fig. 5A. The numerically obtained states of self-stress for a frame with the same domain wall geometry as in Fig. 2, but with the unit cell parameterized by $\left(x_1,x_2,x_3\right)=\left(-0.025,0.025,0.025\right)$ which has a smaller distortion away from the regular kagome lattice and is used in Fig. 5A. The left domain wall still has a net outflux of the topological polarization and localizes states of self-stress, which have a significant overlap with the affine bond extensions ${\mathit{e}}_{\text{x}}$ and ${\mathit{e}}_{\text{y}}$ associated with uniform strains along x and y, respectively. Two independent states of self-stress exist with a significant overlap, shown in A and B.