An apparatus and method for coating a substrate moved along a path of travel through the apparatus. A plasma source issues a plasma jet into which a first reagent is injected from a discharge orifice located upstream of the jet. A second reagent is injected into the jet from a discharge orifice located downstream of the jet. A controller is configured to regulate the flow of the first reagent according to a first set of parameters and regulate the flow of the second reagent according to a second set of parameters. As a result, the first and second reagents are applied to the substrate to form at least one layer of a coating on the substrate.
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