A coil assembly for utilization in a vapor deposition system is described herein that includes at least one subject coil having a length, a height, an inside edge, an outside edge and a thickness, wherein the thickness of the subject coil is measured as the distance between the inside edge and the outside edge and wherein at least part of the thickness of the subject coil is reduced by at least 20% as compared to a reference coil. A coil assembly is also described herein for utilization in a vapor deposition system that includes at least one subject coil having a length, a height, an inside edge, an outside edge, and a thickness, wherein the thickness of the subject coil is measured as the distance between the inside edge and the outside edge and wherein at least part of the height of at least part of the subject coil is reduced by at least 20% as compared to the height of a reference coil.