A four-layer label does not fully describe a rigid-flex assembly. The rigid and flexible regions may use different constructions and impose different constraints.
What to examine in the layout brief
Map the regions, transitions and allowed components before choosing the material stack. Discuss coverlay, bonding, copper type, lamination sequence and handling with the supplier. Keep the intended installed shape visible during placement review.
What belongs in the release record
Release regional construction details and the mechanical review assumptions. Do not treat a rigid four-layer template as a complete rigid-flex manufacturing instruction.
Discuss this with Circuit Edge
Send the current schematic and board revision, mechanical constraints, intended construction and the question you need resolved. Circuit Edge Technologies provides PCB layout, hardware-design support, manufacturing review and practical training from Sector 70, IMT Faridabad. A useful enquiry separates the supplied inputs from decisions that still need agreement, so the scope of the review stays clear.
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Numerical limits and acceptance criteria must come from the actual component documentation, supplier agreement and applicable standards. No proprietary standard tables are reproduced.