Extended question ...
If I wish to build a thermocouple meter with 0.5 deg celcius resolution, do you think 2-layer PCB is enough? Do I need to go for higher number of layer, say 4-layer?
I've never built one before, but I really wish to built one (multi-channel) to monitor my system. If I'm not mistaken, the output voltage of J-type or K-type is in the range of uV (micro-volt). So, I don't know whether 2-layer PCB is enough or not for 0.5 degree celcius resolution.