From db0dc7c6e97c7385a29d4733ac07feb4546b7195 Mon Sep 17 00:00:00 2001
From: omicron <omicron.me@protonmail.com>
Date: Mon, 8 Jun 2026 21:58:40 +0200
Subject: [PATCH] Add FixedRLayer and move the existing Layer into a hierarchy

---
 interfaces.py | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/interfaces.py b/interfaces.py
index e251378..d7a9c2d 100644
--- a/interfaces.py
+++ b/interfaces.py
@@ -1,17 +1,31 @@
 from abc import ABC, abstractmethod
-from dataclasses import dataclass
 
 
-@dataclass
-class Layer:
-    thermal_coefficient: float
-    thickness: float
+class Layer(ABC):
+    @property
+    @abstractmethod
+    def R(self) -> float: ...
+
+
+class MaterialLayer(Layer):
+    def __init__(self, thermal_coefficient: float, thickness: float):
+        self.thermal_coefficient = thermal_coefficient
+        self.thickness = thickness
 
     @property
-    def R(self):
+    def R(self) -> float:
         return self.thickness / self.thermal_coefficient
 
 
+class FixedRLayer(Layer):
+    def __init__(self, r_value: float):
+        self.r_value = r_value
+
+    @property
+    def R(self) -> float:
+        return self.r_value
+
+
 class Interface(ABC):
     @property
     @abstractmethod