Preheat oven to 350°. Place a greased 9-in. springform pan on a double thickness of heavy-duty foil (about 18 in. square). Securely wrap foil around pan., In a large bowl, combine the wafer crumbs, butter, sugar and espresso powder. Press onto the bottom and 1 in. up the sides of prepared pan., In a small bowl, stir together sour cream, half and half and melted chocolate until blended; set aside. In second bowl, combine espresso powder and vanilla extract; set aside., In a large bowl, beat the cream cheese and sugar; add chocolate mixture, cocoa and flour until smooth. Stir in the espresso mixture. Add eggs; beat on low speed just until combined. Pour into crust. Place springform pan in a large baking pan; add 1 in. of hot water to larger pan., Bake until center is just set and top appears dull, 60-70 minutes. Remove springform pan from water bath. Cool on a wire rack for 10 minutes. Carefully run a knife around edge of pan to loosen; cool 1 hour longer. Refrigerate overnight. Remove sides of pan., In a small saucepan, combine liqueur and half-and-half. Bring to a boil; cook until liquid is reduced by half. Meanwhile, in a large bowl, beat whipping cream until it begins to thicken. Add confectioners' sugar; beat until stiff peaks form., Drizzle cheesecake with coffee syrup; garnish with whipped cream, chocolate and coffee beans.