HFC Research Interface Index — Companion Guide: SCFL / UCMS Infrastructure for Cross-Domain Coherence Measurement

The HFC Companion Guide provides a formal reference layer for the Standard Coherence Fidelity Layer (SCFL) and the Upstream Coherence Measurement Stratum (UCMS) as applied to cross-domain coherence measurement.

This document clarifies the relationship between:

• Foundational physics (state trajectories x(t))

• SCFL measurement operators

• Multi-layer structural classification

• Comparative retrospective analysis

• Operator-specific prospective measurement

The framework is substrate-agnostic and designed for application across human, organizational, and institutional systems where timestamped or sequential data exists.

Formal notation is specified for:

• Structural state space x(t) \in 𝒮

• Drift and acceleration derivatives \dot{x}(t), \ddot{x}(t)

• SCFL measurement operator M

• Structural code tuple C_s = (T_i, S_j, D_k)

• Domain separation 𝒟_{retro} \cap 𝒟_{prospective} = ∅

The guide emphasizes falsifiability, replication, and strict separation between retrospective comparative study layers and prospective operator-specific measurement.

No clinical, diagnostic, or treatment claims are made.

All artifacts are published under open academic license.

Primary measurement reference:

Brogdon, R. (2026). Standard Coherence Fidelity Layer (SCFL). Zenodo. https://doi.org/10.5281/zenodo.18622508