A transfer stack for transferring a portion of a foil within a perimeter that includes a transducer to an article such as a medical device or a medical needle; the transfer stack comprising: a carrier substrate; a foil comprising a transducer that is laterally surrounded by a perimeter, the perimeter being within the lateral extent of the foil; and an adhesive layer; wherein a first surface of the foil is attached to the carrier substrate, and the adhesive layer is attached to the second surface of the foil; wherein the first surface of the foil is separable from the carrier substrate by applying in a direction normal to the carrier substrate and at an edge (EF1, EF2) of the foil a first total peeling force that overcomes a first peel retaining force(Fpeel L1,S) and a first tangential retaining force (Ftang L1,S), wherein the edge (E1, EF1, EF2) is outside the perimeter; wherein the adhesive layer is configured to provide adhesion between the foil and an article such that when the article is attached to the foil via the adhesive layer the second surface of the foil is separable from the surface of the article by applying in a direction normal to the surface of the article and at the edge (E1, EF 1, EF2) of the foil a second peeling force (Fpeel L2,A) that overcomes a second peel retaining force (Fpeel L2,A); and wherein the second peel retaining force (Fpeel L2,A) is greater than the first peel retaining force (Fpeel L1,S); and characterized in that the foil is cut along at least a portion of the perimeter that includes the transducer such that when the article is attached to the foil via the adhesive layer and subsequently peeled in a direction normal to the carrier substrate the portion of the foil within the perimeter becomes separated from the carrier substrate at the perimeter by overcoming the first peel retaining force and the portion of the foil within the perimeter remains attached to the article, wherein a second total peeling force applied in a direction normal to the carrier substrate at the edge of the perimeter to separate the portion of the foil within the perimeter is reduced with respect to the first total peeling force. a carrier substrate; a foil comprising a transducer that is laterally surrounded by a perimeter, the perimeter being within the lateral extent of the foil; and an adhesive layer; wherein a first surface of the foil is attached to the carrier substrate, and the adhesive layer is attached to the second surface of the foil; wherein the first surface of the foil is separable from the carrier substrate by applying in a direction normal to the carrier substrate and at an edge (EF1, EF2) of the foil a first total peeling force that overcomes a first peel retaining force(Fpeel L1,S) and a first tangential retaining force (Ftang L1,S), wherein the edge (E1, EF1, EF2) is outside the perimeter; wherein the adhesive layer is configured to provide adhesion between the foil and an article such that when the article is attached to the foil via the adhesive layer the second surface of the foil is separable from the surface of the article by applying in a direction normal to the surface of the article and at the edge (E1, EF 1, EF2) of the foil a second peeling force (Fpeel L2,A) that overcomes a second peel retaining force (Fpeel L2,A); and wherein the second peel retaining force (Fpeel L2,A) is greater than the first peel retaining force (Fpeel L1,S); and characterized in that the foil is cut along at least a portion of the perimeter that includes the transducer such that when the article is attached to the foil via the adhesive layer and subsequently peeled in a direction normal to the carrier substrate the portion of the foil within the perimeter becomes separated from the carrier substrate at the perimeter by overcoming the first peel retaining force and the portion of the foil within the perimeter remains attached to the article, wherein a second total peeling force applied in a direction normal to the carrier substrate at the edge of the perimeter to separate the portion of the foil within the perimeter is reduced with respect to the first total peeling force.