Preheat your oven to the suggested temperature as specified in the recipe. Grease and flour your cake pans.

In a large bowl, sift together the all-purpose flour, Dutch-processed cocoa powder, baking powder, salt, granulated sugar, and baking soda. Mix them thoroughly.

In another bowl, blend the eggs, vegetable oil, unsalted butter, vanilla extract, milk, sour cream, and packed light brown sugar. Combine them well until the mixture becomes smooth and creamy.

Slowly add the dry ingredients to the wet mixture, alternating with the hot coffee. Ensure it's mixed well without lumps.

Pour the batter into prepared cake pans. Bake in the preheated oven according to the recipe's suggested time or until a toothpick inserted in the center comes out clean.

Allow the cakes to cool completely before frosting them generously with the chocolate buttercream.

Once frosted, slice and serve this decadent Anne of Cleves Cake, indulging in its rich flavors and moist texture.