Well it depends on if you take WOG statement. Layers being infinite size. Well we know all layers have countless bubbles but it's different for layer 0 where bubble born. If a bubble gets destroyed it will replaced by another new bubble and logically layer 0 should have infinite supply of bubbles.
Difference between layers bubbles is stated to be one deeper layers bubbles would have 1/10 of each of all shallow layer bubbles.
Layer 1 one bubble would have order of 1/10 * infinite bubbles order of layer 0. Anything is multiplied by infinite is still Infinite.
2A AP tada.