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28 The PCB Magazine • June 2014 HyBRID STRETCHABLE CIRCUITS oN SILICoNE SUBSTRATE continues Figure 3: stretchable interconnects. (a) optical micrographs of a stretchable metallic stripe patterned above a single disk (left) and double disk (right) embedded in the silicone substrate. corresponding electrical resistance change as a function of applied macroscopic strain and cycle number. (b) series of scanning electron micrographs taken across the interconnect surface as a function of the applied strain and location above the rigid disks.