Great article!
> To keep things simple, some hobbyists opt for four-layer boards, with the two inner layers dedicated to GND and Vdd. This works, but means paying about twice as much.
With the prices out of Shenzhen, there is IMO no reason to use a 2-layer board, outside of trivial cases (Like a CAN terminator etc). 4-layers are a bit more expensive, but make routing much easier. I don't want to spend the time solving the routing puzzle on a two-layer board, then worrying about inductance (the article's topic) on top of that.
Baseline 2024 plan: Start with 4-layers as a generic baseline. Go to 6 (or higher?) if your design is sufficiently complex, and/or complex. (Or has high-frequency signals). More layers = more easier.
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