For the first layer transfer, the supported PVA sheet bearing the metal pattern was laminated onto the target substrate using a silicone pasting roller at 120 °C with pressure, followed by 30 s pressure application from above with a soft stamp. The PEN foil was then manually peeled off, leaving the patterned metal and PVA sheet on the target substrate. PVA dissolution was performed either in a boiling water bath (two 5 min treatments with intermediate and final water rinse steps) or overnight in water at room temperature. The structures were subsequently dried using a nitrogen gun.