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TCA9802: Is the outer layer a gold/silver alloy, Gold-or-Silver, or Silver?

Part Number: TCA9802

I ran across a new finish field yesterday for a couple parts.  

On one document, it says "NiPdAuAg", on another, it says "NiPdAu-Ag".

Is the outer layer a gold/silver alloy, Gold-or-Silver, or Silver?

We're just looking for what the outermost layer is.