# 📐  L2 Spec — Implicit Solvation Models (PCM, COSMO, SMD) Mismatch-Only Spec

**ID:** `L2-305-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-305`](/artifact/l1/L1-305)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554118

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| Method | — | PCM, CPCM, COSMO, SMD |
| N atoms | — | 2 – 1000 |
| Solvent | — | water, ethanol, DMSO, toluene, hexane |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.5 * (1 + 0.1 * mismatch_severity)
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |

## 4. Fingerprint

`9b1941a69509f6699ea15ba56a20c2bd2026e59b1ae5f461ca4d8e35951fe674`

## 5. On-chain Registration

- **Chain hash:** `0xe0fafdfb995d1ffefaa1a7544fa16b06d083ad96f5cb4794719f00ee1a54d6e9`
- **Chain tx hash:** `0x5f9d8e48c8cda31129650a1ec3a36a5699419378b112cc0944b567edbd895254`
- **Chain block:** `41554118`

---

## File Mapping

This bundle consists of: `L2-305-001.md`, `L2-305-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-305-001.md` | Source of truth — edit this | Human or LLM |
| `L2-305-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-305-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._