The initial 2D GCC is composed of crystalline grains with diameter D=100 in an amorphous matrix with thickness l=40. The zoom-in of the local amorphous and crystalline areas are shown in the left and right panels, respectively. The amorphous region is a 50%:50% mixture of large (blue) and small (grey) particles. The 16 crystalline grains have random lattice orientations and are composed of small particles.