There is an increasing requirement in {HEAD ~ todays designs} to match length, time, {TAIL ~ resistance} and capacitance across nets on a per layer basis 
There is an increasing requirement in { HEAD ~ todays designs } to match length , time , { TAIL ~ resistance } and capacitance across nets on a per layer basis
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH