HDMI Design in Two Layer PCB

Hi,

I have already done HDMI (ADV7623 &  ADV7622) in 4 Layer PCB and passed all comliance tests.

Now planning to change my design to TWO Layer PCB.

Is there any Document or Technical Note available for HDMI two layer PCB design?

What are the specific area or key informaiton i need to consider during this design?

How to Maintain the Controll Impedance for Differential traces in Two Layer PCB?

Regards,

Thamizh