Aspect Ratio = Wire height /wire width
wire height is basically the thickness of the deposited metal.

Coupled RC Trees :The RC Trees with floating capacitor hanging from the tree nodes .

Three ways to compute elmore delay and voltage moments
(1)Decoupling techniques are used.this method is restricted to very simple circuit model
(2)general method for RC interconnect network
(3)The core theory being used is the length of coupling

Technique of Source splitting is used to split each floating current source into two ground sources so that the coupled RC trees are decoupled and the algorithm of moment computation for single RC tree can be applied

Arbitrary interconnect are represented by crosstalk adjecency and net graps are proposed

REFERENCE 3

The coupling capacitance between intercore interconnects are significantly higher than the corresponding interconnect when applied to COBS.