Abstract: A method of fabricating a heterostructure system, comprises epitaxially growing a crystalline layer of a first substance on a crystalline base layer by surface catalysis in a solution, wherein the growth is self-terminated once a monolayer of the substance is formed on the base layer.

Abstract: Apparatus (20) is provided that includes a battery (48) including first and second poles (78, 79); and a circuit board (50) that includes electronic circuitry (53), the second pole (79) electrically coupled to the circuitry (53). A battery-isolation tab (42, 142) is removably disposed between the first pole (78) and the circuitry (53), and includes a non-conductive substrate (90) configured to electrically isolate the first pole (78) from the circuitry (53), while the tab (42, 142) is disposed between the first pole (78) and the circuitry (53); and a conductive layer (92) disposed upon the non-conductive substrate (90), the conductive layer (92) being electrically coupled to the first pole (78) and configured to facilitate electrical coupling of the first pole (78) to the circuitry (53), while the tab (42, 142) is disposed between the first pole (78) and the circuitry (53). Other embodiments are also described.

Abstract: A method of fabricating a heterostructure system, comprises epitaxially growing a crystalline layer of a first substance on a crystalline base layer by surface catalysis in a solution, wherein the growth is self-terminated once a monolayer of the substance is formed on the base layer.