What specifications do I need to note?
Hi, @Thu_n_T_Minh
Welcome to the forum!
It depends on your specific requirements. I ordered a very “standard” 4 layer board from OSHPark back in December. I did not specify anything. The boards have been assembled, they work well, and I am very happy with them.
I have previously had similar happy results with a 4 layer board from JLCPCB.
What is the function/requirements of your board, and who are you ordering them from?
If you cannot tell us this, then I doubt (??) that anyone on this forum will be able to tell you much more.
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Basically i want to create 4 layer to optimize space , and reduce EMI to my sensor
I think your board manufacturer can answer that best. The KiCAD-forum is the wrong place for questions like these.
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That little bit sounds “normal-standard”.
The typical 4 layer stackup has close spacing L1-L2 and L3-L4. This works well to control EMI with a ground layer on L2.
I THINK the usual copper thickness is 0.5 oz but top and bottom may be plated up to about 1.0 oz. This works well for most designs unless you have very high current.
Heavier copper suits higher current but increases minimum geometry sizes.
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Just use the default 4-layer process your PCB house uses.
There is absolutely no need to specify any parameters in KiCad. Just draw your PCB and submit it.
But remember - always work from a schematic!
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