The four terminal resistor I introduced in my previous post is good but expensive and not handy out side of Japan. Next land pattern for a SMT chip resistor will work as a pseude four terminal circuit. 1.5 - 2 mOhm 1-2W chip resistor on 70um copper PCB will do 10A max measurement.

 ------+-----+  +-----+------
from   |     |  |     | to
Power  |     |  |     | load
source |     |  |     |
 ------+-----+  +-----+------
             |  |
             |  |
            (+)(-)
            to Amp

Tsuneo