[SI-LIST] Calculating the Z0 of a trace

Dear all,
             I am new to PCB design and i have a few doubts as listed below
 
1. I have a board with the stack up S G S S P G S S P S if i want to find the 
Z0 of a trace on the 4th layer then how do i do it? 
2. is that type called a stripline, i have read that stipline is a trace 
bounded by ground planes on either side. and microstrip is the one with ground 
on one side and air on the other. what is the type of trace on the  4th layer 
of my board? 
3. I have been through Dr. howard jhonson's handbook where crosstalk is 
calculated as = k/1+(d/h)^2 what is K and when we get a number as a result of 
the calculation how to use that number in determining the crosstalk or use it 
for our purpose.  
 
can anybody please help/guide me 
thanks in advance 
warm regards
Fareed 


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