I also saw this recommended in the past for assigning functions (like serving as a ground plane) to layers depending on the numnber of layers that your board is

I also saw this recommended in the past for assigning functions (like serving as a ground plane) to layers depending on the numnber of layers that your board is going to have: https://web.archive.org/web/20201112034911/http://www.hottconsultants.com/techtips/pcb-stack-up-2.html https://web.archive.org/web/20201112034911/http://www.hottco... https://web.archive.org/web/20201224132837/http://www.hottconsultants.com/techtips/pcb-stack-up-3.html https://web.archive.org/web/20201224132837/http://www.hottco... ...