Preheat oven to 325°. Layer half of the wafers in a greased 13x9-in. baking dish. In a small bowl, dissolve 2 teaspoons coffee granules in 2 tablespoons hot water; brush 1 tablespoon mixture over wafers. Set remaining mixture aside., In a large bowl, beat cream cheese and sugar until smooth. Beat in sour cream. Add eggs; beat on low speed just until blended. Remove half of the filling to another bowl. Dissolve the remaining 3 teaspoons coffee granules in the remaining 1 tablespoon hot water; stir into 1 portion of filling. Spread over wafers., Layer remaining wafers over top; brush with reserved coffee mixture. Spread with remaining filling., Bake 40-45 minutes or until center is almost set. Cool on a wire rack 10 minutes. Loosen sides from dish with a knife. Cool 1 hour longer. Refrigerate overnight, covering when completely cooled., To serve, spread with whipped topping. Dust with cocoa.