I have some trouble about the design of my homemade double sided pcb shield. I'm not an electronic engineering, i'm just an hobbyist. In my shield i have a 9V power input and from that, using two separate circuits (with two voltage regulator), i split the 9V input power in two power line, respectively in 5V and 3.3V for supplies three IC components present on my shield. I have designed my shield using the bottom side for the ground plane and the top side for routing all track, splitting the top side into three separate areas where i placed three separate power plane. One power plane is for the input voltage and the two voltage regulator circuits. The other two areas are for the 5V circuit and for the 3.3V circuit. Is correct to design the top plane into three separate power plane as I did? I attach two images to better explain what i did.