Arrange an oven rack in the center of the oven. Preheat the oven to 350 degrees F. Butter and flour the bottom and sides of 2 nonstick, round baking pans. Set aside.
In a bowl combine the flour, baking powder and orange peel. Mix for 20 seconds at low speed until the zest is incorporated. Add the orange juice, eggs, sugar and butter.
Blend at low speed for 1 minute. Increase the speed to medium and mix for about 2 minutes, scraping the bottom and sides of the bowl with a spatula, as needed.
Divide the batter between the prepared pans and bake until golden and a cake tester inserted into the center of the cakes come out clean, about 30 to 35 minutes. Remove from the oven and cool the pans on a wire rack for 15 minutes. Turn the cakes out onto a wire rack and allow to cool completely, about 1 hour.
To assemble the cake: Arrange 1 cake layer, flat side up, on a cake stand. Using a spatula, spread the marmalade on top leaving a ½-inch border. Place the other cake layer on top of the existing layer then sprinkle with powdered sugar. Cut the cake into wedges with a slightly wet knife and serve.