A method of forming a hybrid oxide capping layer is disclosed and used in a magnetic tunnel junction to enhance thermal stability and perpendicular magnetic anisotropy in an adjoining free layer. The printed circuit board includes: an electrically insulating board ; electrically conductive printed circuitry ; and an electrically insulating solder mask having vias through which the one or more light emitting chips electrically contact the printed circuitry. The barrier layer, the ruthenium layer, the tungsten nucleation layer and the tungsten bulk layer are independently deposited by an ALD process, a CVD process or a PVD process, preferably by an ALD process. A collimator body has a collimator bore to receive the shuttle plug and constrain the shuttle plug in the collimator bore to be movable in an axial direction along an axis of the collimator bore. This structure enables improving protection of personal information by protecting not only personal information but also information that cannot be used independently to identify a person but can be easily correlated with other information and used to identify a specific individual with reference to the other information.