Preheat oven to 350F. Cream butter and sugar well. Beat in eggs 1 at a time. Add orange rind. Mix.
Combine flour, baking powder and salt in small bowl. Add orange juice to butter mixture in 2 parts alternately with flour mixture in 3 parts, beginning and ending with flour mixture. Spread in 2 greased 9 inch round layer pans. Bake in oven for 25 to 30 minutes until an inserted wooden pick comes out clean. Ice with Orange icing.
Orange Icing: Beat all ingredients together in bowl until smooth. Add more liquid or icing sugar as needed. Makes about 1 1/3 cups.