English: Supplementary Movie 2 Simulated evolution of the telephone cord buckle. The simulated evolution of an initial straight-sided blister into complex buckle-delamination patterns validated by the experimental observation in Movie 3. After the secondary buckling instability occurs, the straight-sided blister tends to be the telephone cord buckle. Further propagation of the buckle shows a rich coalescence behavior accompanied with the increase of the buckling width. The telephone cord buckle becomes larger and larger with the appearance of several spikes and/or daughter telephone cord buckle at the outer undulated edge. The simulated result is obtained by numerically solving the above outlined continuum model in a computational cell of size 256h×256h with periodic boundary conditions using input parameters ε0αβ=εm δαβ, εm=0.03 μf/μs=4, vf=0.3, vs=0.5,Γ*Λi=ΓΛi/Γζ=0.01, δn=0.2h, δt=2δn, γ*n=γn/eδnμs=0.019 and γ*t=γt/eδnμs=0.019.