Standard 4 layer PCB has only mentioned single ended , Diff 90 and 100 impedance Trace width and space requirements.
This does not described Top or bottom Co-planer waveguide Trace width and Space from adjacent ground layer.
4 Layer 1.6mm ENIG Design Rules - 
Knowledge Base / 
Design Rules - AISLER Creative Community
RF trace need CPW as below stackup, while I get coupen test report when I place oder for standard 4 layer stack-up?
Hey @Ronak-Shah ,
An impedance check can be requested. To do so, please request a quote for your project, letting us know what tolerance you require.
Compliance with the impedance values is then checked using a separate test coupon for each production run. All the different Z0 values for each layer are measured and recorded.
Does that help? 
Hi Sarah,
Can you share recommanded Width and Space for single-ended 50 Ohm Co-planer Trace requirment to meet 50 ohm +/-10 % Impedance on standard 4-layer Aisler PCB.
Then I will create layout with this W/S and while placing order, I will require CPW impedance testing .
Thanks,
Ronak
Hey Ronak-Shah 
to receive recommandations for the impedance testing, I would recommend that you send an email to our support team: support@aisler.net
Thank you!
Sarah
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