Abstract: A target assembly for material deposition includes a first target piece having a first sputtering surface and comprising a first target material that is to be sputtered off the first sputtering surface and to deposit on a substrate. The target assembly also includes a second target piece juxtaposed to the first target piece. The second target piece comprises a second sputtering surface and a second target material that can be sputtered off the second sputtering surface and to deposit on the substrate. The first target piece and the second target piece are configured to be switched in positions and/or orientations after a period of sputtering operations.