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bq51013B PCB layout

Hi

I looked into this document:

http://www.ti.com/lit/ug/sluua44a/sluua44a.pdf

in section Layout and Bill of Material 

there are some things that I couldnt understand...

• AC1 and AC2 trace resistance - what did you ment? what should be the resistance? 
• OUT trace resistance - same as last question.
• RECT trace resistance - same as last question.
• GND connection - what should I pay attenetion to in that connection?

is there any place where the PCB considerations are written extensively?

thanks in advanced,