Preheat oven to 180ºC . Grease and flour two 23 cm round cake pans. Prepare cake mix according to package directions. Turn batter into prepared pans. Bake according to package directions (30-35 minutes). Let cake cool in pans 15 minutes, then unmold and let cool completely on wire racks. In a medium bowl, combine ricotta cheese, powdered sugar, cream, vanilla, and orange zest. Beat with an electric mixer on medium speed untl light and fluffy, about 2 minutes. Stir in chocolate chips and one third cup almonds. Sprinkle 1 tablespoon orange liqueur over top of each cake layer. Stack cake layers together with cheese filling in between and on top and sides. Sprinkle remaining one third cup almonds around top edge of cake in a 3 cm-wide ring. Refrigerate until serving time.